How to Build a Weekly Google Ads Change Log That Explains Performance

Performance questions in Google Ads are almost never hard because the data is missing. They are hard because nobody recorded what changed, when, or why. Six weeks later, three plausible stories fit the same chart and there is no way to choose between them.

A change log fixes that for less effort than one monthly report.

The seven-field template

Writing the expected effect before the result arrives is the field most often skipped and the one that does the most work. It is the difference between a test and a story told afterwards.

Start from Change history, then add what it cannot see

Google Ads Change history gives you a dated record of account edits, including automated ones, and it should be your weekly starting point. What it cannot record is everything outside the account. Add a line each week for:

• Price, offer or promotion changes.
• Stock outages or service capacity limits.
• Website deploys, especially to landing pages or forms.
• Phone system, CRM or lead-routing failures.
• Seasonal closures, holidays and weather events.
• PR coverage, or a visible competitor campaign.

In our experience these explain more sudden swings than any bid adjustment does, and they are invisible in every platform report.

Observation, cause, decision

For anything notable, write three lines. The observation is a neutral statement of fact: cost per conversion rose 40 percent week over week. The causes are all candidates, including the ones you cannot test: the target change on the 9th, a landing page deploy on the 10th, seasonality, a tracking fault. The decision names what you will do and when you will judge it.

The discipline is in keeping the observation free of the cause. Once a cause is written into the observation, nobody re-examines it.

Log automated features too

Automation still counts as a change. Search Engine Roundtable reported Google's new automated-promotions documentation on September 7, 2026, and Google confirms how the feature operates and which controls exist. When an automated feature is switched on, switched off, or has its controls adjusted, that belongs in the log with a date like anything else. We make no claim here about whether it is available in your account, whether it is serving, or what it would do to your results.

The weekly rhythm

1. Open Change history and copy this week's edits into the log.
2. Add the outside-account events.
3. Review entries whose evaluation date has arrived and record the outcome.
4. Decide this week's changes and write their expected effects.

Thirty minutes, same slot every week. It compounds quickly.

Why we wrote this one

Between August 10 and September 6, 2026, Google Search Console recorded 671 impressions for "ppc management services" at an average position of 13.52 with zero clicks, 312 impressions for "ppc management" at 17.60, and 84 impressions for "google ads management vancouver" at 18.35, for our own site. These are ThinkProfits visibility observations, not market search volume.

Our PPC advertising and Vancouver PPC agency pages describe how we run accounts, reporting dashboards shows how the log surfaces in the monthly pack, and digital marketing strategy is where the budget decisions behind these changes get made.